Pump Control System Using Current Monitoring to Prevent Dry Running
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Solution Overview
Problem
Existing pump control systems using pressure switches can cause unnecessary pulsing and uneven water flow, lead to continuous operation and battery over-discharge due to insufficient power, and risk overheating when the water supply runs dry.
Innovation Solution
A pump control system that uses a pressure sensor and current monitoring to deactivate the pump when there is no demand, adjusts current thresholds based on voltage levels, and employs pulse width modulation to manage power efficiently, preventing dry-running and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a pressure switch is used to control pump on/off based on liquid pressure, then the pump can be turned off when pressure is sufficient, but the pressure switch can cause the pump to turn off and on unnecessarily causing pulsing in water delivery resulting in noise and uneven water flow
Solution Approach 1:
The patent applies dynamics by transitioning from static pressure threshold switching to dynamic multi-parameter monitoring. The control system continuously monitors pressure, current, and time parameters, adjusting pump operation dynamically based on the combination of these parameters rather than relying on a single static pressure threshold. This prevents unnecessary on/off cycling and associated pulsing and noise.
Solution Approach 2:
The patent implements feedback by using multiple sensors (pressure sensor, current sensor) to continuously monitor system state and feed this information back to the control unit. The control unit processes this feedback information and adjusts pump operation accordingly, preventing unnecessary cycling that causes pulsing and noise while optimizing energy consumption.
2Adaptability or versatility
If the pump is run from batteries, then the system can operate independently, but when batteries are in a relatively run down state, they do not provide sufficient power to produce sufficient pressure to cause the pressure switch to operate, leading to continuous pump operation and battery over-discharge
Solution Approach 1:
The patent uses feedback from current sensors and voltage monitors to detect battery state of charge and pump operating conditions. When batteries are run down, the system detects insufficient current/voltage levels and prevents continuous pump operation that would lead to over-discharge, thereby protecting battery reliability while maintaining system independence.
Solution Approach 2:
The patent applies parameter changes by monitoring multiple electrical parameters (current, voltage, power) in addition to pressure. When battery parameters indicate low state of charge, the system adjusts operation parameters to prevent over-discharge, enabling the system to adapt to varying battery conditions while maintaining reliability.
3Stability of the object's composition
If the pump continues to run when water supply runs dry, then the pump can maintain pressure readiness, but the pump overheats and permanent damage occurs
Solution Approach 1:
The patent implements feedback through pressure sensors and current sensors that continuously monitor water flow conditions. When the water supply runs dry, the feedback signals indicate abnormal conditions (pressure changes, current changes) and the control unit stops pump operation, preventing overheating while maintaining pressure readiness when water is available.
Solution Approach 2:
The patent uses current monitoring as an intermediary indicator of water flow conditions. By monitoring pump current, the system indirectly detects whether water is flowing through the pump. When current patterns indicate dry running conditions, the system intervenes to stop operation, preventing overheating while maintaining system readiness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces pulsing and uneven water flow, conserves battery power, prevents overheating, and ensures smooth operation by accurately detecting demand and adjusting power usage, thereby enhancing the reliability and efficiency of the pump system.
Implementation Method 1
the control apparatus comprises, or is co-operable with, a pressure sensor that is responsive to the pressure of fluid in the plumbing system
Implementation Method 2
A pump control system uses a pressure sensor and current monitoring to deactivate the pump when there is no demand
Data Source
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AI summary
A pump system for a caravan or the like comprising a controller that monitors the current drawn by the pump and deactivates the pump when the current decreases below said one or more current threshold values. A first current threshold value corresponds to the current drawn by the pump when pumping fluid at a rate corresponding to taps being closed. A second current threshold value corresponds to the current drawn by the pump when running dry. Deactivating the pump using detected current levels prevents uneven water flow and other disadvantages associated with deactivating the pump using a pressure switch.